Extrusion presses



March 10, 1964 G. P. KRAUSE 3,124,250

EXTRUSION PRESSES Filed Jan. 19, 1961 8 Sheets-Sheet 1 *N I II M g 1 s March 10, 1964 G. P. KRAUSE Filed Jan. 19, 1961 EXTRUSION PRESSES 8 Sheets-Sheet 2 March 10, 1964 KRAUSE 3,124,250

EXTRUSION PRESSES Filed Jan. 19, 1961 8 Sheets-Sheet 3 March 10, 1964 ca. P. KRAUSE 3,124,250

EXTRUSION PRESSES Filed Jan. 19, 1961 8 Sheets-Sheet 5 FIGZC March 10, 1964 G. P. KRAUSE 3,124,250

EXTRUSION PRESSES Filed Jan. 19, 1961 8 Sheets-Sheet 6 March 10, 1964 G. P. KRAUSE EXTRUSION PRESSES 8 Sheets-Sheet 7 Filed Jan. 19, 1961 March 10, 1964 G. P. KRAUSE EXTRUSION PRESSES 8 Sheets-Sheet 8 Filed Jan. 19, 1961 W WE United States Patent 3,124,250 EXTRUSIGN PRES'SES Gerhard Paul Krause, Pittsburgh, Pa, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany Filed Jan. 19, 1961,. Ser. No. 83,307 (Zlaims priority, application Germany Jan. 25, 1960 7 Claims. {CL 297-1) invention relates to an extrusion or tube press the die of which is rock-able into and out of the operative position, particularly by means of a holder arm which can be locked in the operative position by means of a slider. The object of the invention is to enable the die of such a press to be shifted upwards or downwards. By such a shifting, vertical displacements of the die, 0ccasioned by thermal action upon the holder arm, can be largely counteracted. A further development of the invention provides for also enabling horizontal displacements of the die to be effected. It is then possible to impart to the die, if it is constructed as a flat die, any position which is favourable to the flow of material out of the container.

The invention consists in the feature that the slider serving for the locking of the holder arm is slid-able in a bed which is adjustable upon circular arcs around the axis of the holder arm. In this way the requirement for the adjustment in the height of the die is taken into account.

The invention further comprises the feature that the holder arm is made in two portions, an outer portion and an inner portion, the distance of the outer portion from the inner portion being adjustable. it is by this means that the horizontal displacement is rendered possible.

Further features of the invention concern the constructional design of the said parts.

One constructional example of the invention is illustrated by the accompanying drawings, in which:

FIGURES 1a and lb illustrate in plan, a press according to the invention, some parts being shown in section;

FIGURES 2a, 2b and 2c illustrate the structure shown in FIGURES 1a, 1b, partly in elevation and partly along line lill of FIGURES 1a and lb;

FIGURE 3 is a view partly in elevation and partly in transverse section looking :to the left of FIGURE 2a toward the die and with the container withdrawn;

FTGURE 4 is a fragmentary view illustrating a portion of the structure shown in FiGURE 3 on an enlarged scale;

FIGURE 5 shows a section on the line VV in FIG- URE 4;

FIGURE 6 shows a section on the line VIVI in FIGURE 4; and

FiGURE 7 a section on the line VII-VII in FIG- URE 4.

Upon a foundation structure .1 rests a cylinder crossbeam 2, which is integral with the working cylinder 3. in the working cylinder 3 a piston 4 moves forwards (to the left) when pressure liquid is introduced into the cylinder 3 through an aperture 5. The piston 4 is connected with a platen 6, which slides upon guides 7 on the foundation structure 1. The platen carries a. press ram 8, which, during the advance of the piston 4, is introduced into the sleeve 9 of a container 10. The container it} is mounted in a containenholder 11, which is axially displaceable upon horizontal guideways, not shown. For the purpose of this displacement there are secured to the container-holder four guiding rods 12, which pass through corresponding bores in the cylinder cross beam 2, and are secured to a ring-traverse 13, which can slide upon a guideway '14. The ring-traverse 3,124,25d Patented Mar. 10, 1964 itself is rigidly connected with two laterally arranged piston rods 15, the pistons 16 of which slide in containerdisplacing cylinders 17 when they are acted upon by pressure liquid on one side or the other. For the returning of the platen 6 when it has advanced towards the left, two retracting cylinders 18 are employed, one of which is anranged above and the other below, and in which move pistons 19, which are attached to the platen 6 by means of piston rods 29 and nuts 21. A mandrel 22 is longitudinally slidabie in the ram 8 by means of a piston 23, in a cylinder 24, which is connected with the platen 6. A worm 25 serves for rotating the mandrel 22, Mid rods 26, with nuts 27, serve for limiting the movement of the platen 6 towards the left.

At the left-hand end on"; the foundation structure 1 is located a press bolster 32, which is connected with the press cylinder 3 by four tension columns 33, which are secured to the press cylinder by means of nuts 34. The bolster 32 carries in the usual manner a pressure body 35, against which bears :a pressure plate 36, with the die 37. The pressure plate 36 and the die 37 are mounted together in a double-sided holder arm 38, 38a, which is rotatable with a spindle 39. On the other end, the lefthand end in FIGURE 3, of the holder arm 38a, is mounted a second die 37a. The spindle 39, upon which the holder arm 38 is mounted fast, carries a hollow shaft 49, with teeth 41, which can be rotated in one direction or the other by moving a toothed rack 4-2 up or down. An appliance 43 serves for coupling the spindle 39 with the hollow shaft 4d for rotation. A piston 44 and a cylinder 45 (in FIGURE 1) serve to displace the spindle 39 in an axial direction. By 47 (in FIGURE 3) are indicated shears that can cut off an extruded rod, after the container has travelled towards the right. By 46 is denoted a saw, which can act upon the extruded product from below when the container has moved to the right.

FTGURE 3 shows that the holder arm consists of an inner portion 38, and two outer portions 38a mounted on it, which carry the dies. By rocking the holder arm 38, 38a about the spindle 39, therefore, the die can be rocked into and out of the axis of the press. The inner portion 38 of the holder arm has a bore, in which a spigot 58 on y the outer portion 38:: of the holder arm is inserted. The

outer portion 38a is moreover secured to the portion 38 by means of four screws 51, spacers 52 being provided between the two portions, so that the distance of the holder-arm portion 38a from the spindle 39 can be variously dimensioned by means of the spacers 52 and the screws 51. The outer portion 38a of the holder arm is forked in shape. To it is secured, by means of screws 54, a guide-holding fork 53 for the die. The die can be pushed into the fork 53, and taken out of it, when the holder arm is rotated through The die is held in the fork by a bell-crank lever 55, 56, which is mounted upon a pivot 57, which in its turn is supported in the forked member 38a. The bell-crank lever 55, 56, is adjusted by a rod 58, which is supported in the portion 33a, and which presses the lever 55, under the action of a spring 59, on to the die, so that the die cannot roll out of the fork.

For locking the rotary arm 33, 38a in the position shown in FIGURE 4 a slider 6b is employed, which can be displaced in a bed 61. This slider also is of forked formation, and embraces with its prongs 62 the fork of the portions 33a, 53, when it stands in the operative position shown in FIGURE 4. When it is drawn back towards the right, the rotary arm 3%, 38a can be rotated.

In the slider so there is an insertion piece 63, which likewise serves for holding the die. Now the bed 61 is so arranged on the bolster 32 that it can be rotated about the spindle 39. For this purpose it has elongated holes 64, 65, 67, which are curved around the axis of the spindle 39 along circular arcs 62, 9, 70. In these elongated holes engage bolts 71, 72, 73, and '74 respectively. The bed 61 has an attachment or extension 75, which engages in a bearing block 76, which is rigidly secured to the bolster 3-2. In the bearing block 76 are mounted two set-screws 77, by the actuation of which the bed 61 can be raised and lowered. During this raising and lowering it then executes, owing to the shape of the elongated holes 64, 65, 66, and 67, an arcuate movement about the axis of the spindle 39. In the bolster 32 another stout bolt 78 is provided, upon which the bed 61 can mount. In order that the bed, even in a raised position, may have the desired support underneath, spacers 79 are provided. On the bed 61 there is a central longitudinally extending rail 86, which engages in a corresponding longitudinal groove 81 in the slider 6%. At two places in the groove 81, calottes or caps 32. (.re provided, upon which the slider glides. A further guide for the slider is formed by slide bars 33.

I claim:

1. An extrusion press, comprising: a bolster, a container secured to the bolster, a die-holder arm pivotally mounted on the bolster in such a position that a die carried thereby can be rocked into and out of alinernent with the axis of w the container, a bed, serving as a siideway, carried by the bolster, and a slider displaceable in the bed towards and away from the axis of the container, the slider being adapted, when displaced towards the axis of the container, to locx the die-holder arm in its operative position,

and being adapted, when displaced away from the said axis, to allow the die-holder arm to be turned about its pivotal axis, the bed being so mounted upon the bolster that it can be adjusted through a small angle about the pivotal axis of the die-holder arm, and the press further comprising means for clamping the bed in its adjusted position.

2. An extrusion press as claimed in claim 1, the bed being formed with arcuate slots having their centers of curvature in the pivotal axis of the die-holder arm, and the press further comprising bolts extending through the said arcuate slots into the bolster for clamping the bed in its adjusted position.

3. An extrusion press as claimed in claim 1, further comprising: a stout bolt in the bolster for supporting the weight of the bed, and spacers interposed between this bolt and the bed to allow for the angular adjustment of the bed.

4. An extrusion press as claimed in claim 1, further comprising: a forked bearing block rigidly secured to the bolster, a projection on the bed engaging between the prongs of the forked bearing block, and set screws in the prongs of the forked bearing block and engaging the said projection for adjusting the angular position of the bed.

5. An extrusion press as claimed in claim 1, the dieholder arm being adapted to hold two dies, one at each end, at equal distances from the pivotal axis of the said arm.

6. An extrusion press as claimed in claim 1, the dieholder arm being made in at least two parts, one being directly mounted pivotally on the bolster and the 03131 being directly adapted to hold a die, and these two parts being so connected with one another that the radial distance between the pivotal axis and the die is adjustable.

7. An extrusion press as claimed in claim 6, one of the two parts of the die-holder arm comprising a spigot directed radially in relation to the pivotal axis of the said arm, and the other of the two parts being formed with a recess in which the said spigot is a sliding fit, and the dieholder arm further comprising screws holding the two parts together, and exchangeable spacers interposed between the two parts.

References Cited in the tile of this patent UNITED STATES PATENTS 

1. AN EXTRUSION PRESS, COMPRISING: A BOLSTER, A CONTAINER SECURED TO THE BOLSTER, A DIE-HOLDER ARM PIVOTALLY MOUNTED ON THE BOLSTER IN SUCH A POSITION THAT A DIE CARRIED THEREBY CAN BE ROCKED INTO AND OUT OF ALINEMENT WITH THE AXIS OF THE CONTAINER, A BED, SERVING AS A SLIDEWAY, CARRIED BY THE BOLSTER, AND A SLIDER DISPLACEABLE IN THE BED TOWARDS AND AWAY FROM THE AXIS OF THE CONTAINER, THE SLIDER BEING ADAPTED, WHEN DISPLACED TOWARDS THE AXIS OF THE CONTAINER, TO LOCK THE DIE-HOLDER ARM IN ITS OPERATIVE POSITION, AND BEING ADAPTED, WHEN DISPLACED AWAY FROM THE SAID AXIS, TO ALLOW THE DIE-HOLDER ARM TO BE TURNED ABOUT ITS PIVOTAL AXIS, THE BED BEING SO MOUNTED UPON THE BOLSTER THAT IT CAN BE ADJUSTED THROUGH A SMALL ANGLE ABOUT THE PIVOTAL AXIS OF THE DIE-HOLDER ARM, AND THE PRESS FURTHER COMPRISING MEANS FOR CLAMPING THE BED IN ITS ADJUSTED POSITION. 